Imaging FTS: A Different Approach to Integral Field Spectroscopy
Figure 2
(a) Series of images from a raw data cube (only one camera is shown). The target is a section of NGC 6992 (Cygnus Loop), obtained through a 650–680 nm filter with SpIOMM (Section 2.3). Notice the fringes, moving from one frame to the next, caused by a combination of night sky (OH) and nebular (H, [NII], [SII]) emission lines. (b) Images from the raw data cube can be co-added to provide a deep, panchromatic image (within the limits of the filter). (c) This image is obtained after Fourier transforming the original data cube and extracting the H (red) and [NII] 6584 (blue) images. (d) Spectrum from a group of pixels in the same cube. Doppler maps of the field can also be extracted for each line from the 400000 spectra in this cube.
